You are right about them being a pig to adjust, I wish I had thought of your brilliant mod about 50 years ago, never seen one on a 2 stroke before.
I got shot of them after a while as for a road bike if you forgot to turn of the fuel as you stopped you ended up with a sump full, I don't think they were ever intended for road work so I switched to twin Amals which seemed to work almost as good except on full bore.